CN107019995B - The method and vacuum desorption discharge system of purifying biogas are washed for pressure (hydraulic) water - Google Patents
The method and vacuum desorption discharge system of purifying biogas are washed for pressure (hydraulic) water Download PDFInfo
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- CN107019995B CN107019995B CN201710427813.2A CN201710427813A CN107019995B CN 107019995 B CN107019995 B CN 107019995B CN 201710427813 A CN201710427813 A CN 201710427813A CN 107019995 B CN107019995 B CN 107019995B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 249
- 238000003795 desorption Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 44
- 238000010521 absorption reaction Methods 0.000 claims abstract description 80
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 63
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 46
- 230000006837 decompression Effects 0.000 claims abstract description 45
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 31
- 238000005406 washing Methods 0.000 claims abstract description 26
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000007701 flash-distillation Methods 0.000 claims abstract description 9
- 238000010079 rubber tapping Methods 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 21
- 239000000047 product Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 12
- 239000010935 stainless steel Substances 0.000 claims description 12
- RGCLLPNLLBQHPF-HJWRWDBZSA-N phosphamidon Chemical group CCN(CC)C(=O)C(\Cl)=C(/C)OP(=O)(OC)OC RGCLLPNLLBQHPF-HJWRWDBZSA-N 0.000 claims description 11
- 238000007599 discharging Methods 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- 239000000945 filler Substances 0.000 claims description 9
- 238000012856 packing Methods 0.000 claims description 8
- 238000012546 transfer Methods 0.000 claims description 8
- 238000004090 dissolution Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 239000008399 tap water Substances 0.000 claims description 4
- 235000020679 tap water Nutrition 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 2
- 238000010828 elution Methods 0.000 claims 1
- 238000002156 mixing Methods 0.000 abstract description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 50
- 239000007789 gas Substances 0.000 description 39
- 229960004424 carbon dioxide Drugs 0.000 description 28
- 238000005265 energy consumption Methods 0.000 description 12
- 238000000746 purification Methods 0.000 description 9
- 239000003673 groundwater Substances 0.000 description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 238000007689 inspection Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 238000004448 titration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- -1 Physical Absorption Substances 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OAXIUZFXLOZILE-UHFFFAOYSA-N 2-(2-methoxyethoxy)propane Chemical class COCCOC(C)C OAXIUZFXLOZILE-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical class CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- SIXOAUAWLZKQKX-UHFFFAOYSA-N carbonic acid;prop-1-ene Chemical compound CC=C.OC(O)=O SIXOAUAWLZKQKX-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- LYCAIKOWRPUZTN-UHFFFAOYSA-N ethylene glycol Natural products OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- HXJUTPCZVOIRIF-UHFFFAOYSA-N sulfolane Chemical compound O=S1(=O)CCCC1 HXJUTPCZVOIRIF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1475—Removing carbon dioxide
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
- C10L3/102—Removal of contaminants of acid contaminants
- C10L3/104—Carbon dioxide
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Gas Separation By Absorption (AREA)
- Treating Waste Gases (AREA)
Abstract
A kind of method and vacuum desorption discharge system for washing purifying biogas for pressure (hydraulic) water, it includes biogas compressor, heat exchanger, drier, booster pump, flash column, decompression tower, desorber, water tank, desorber vacuum pump, desorber Vacuum discharge pump；Biogas is pressurizeed through biogas compressor and is sent into absorption tower later through heat exchanger is cooling；Water enters after cooling down, pressurize through booster pump through water cooler from absorption tower top, and biogas is inversely contacted with water from bottom to top in absorption tower, rich CH4Gas is discharged from the top on absorption tower；The water being discharged from absorb the bottom of the tower enters flash column, the CH released4And CO2Mixed gas returns air accumulator and participates in washing again separating with unstripped gas mixing again；The water being discharged from flash distillation tower bottom enters decompression tower, and the carbon dioxide desorbed is discharged from the top of decompression tower；Enter desorber from the water that decompression tower bottom is discharged later, the gas desorbed is discharged at the top of desorber, and the water being discharged from desorption tower bottom enters water tank through desorber Vacuum discharge pump.
Description
Technical field
This programme is related to gas-liquid mass transfer technical field more particularly to a kind of washes the method for purifying biogas and true for pressure (hydraulic) water
Sky desorption discharge system.
Background technique
Biogas is a kind of important clean reproducible energy, can not only substitute coal fired power generation and heat supply, and by net
Changing can be as the substitute of natural gas after purifying.Marsh gas purifying purification relates generally to the processes such as desulfurization, decarburization, dehydration, dedusting,
Wherein Methane decarbonization is the committed step of marsh gas purifying purification.Decarbonization method mainly have pressure-variable adsorption, UF membrane, Physical Absorption,
Chemical absorbing, cryogenic separation and in-situ purification etc., wherein Physical Absorption method is to utilize CO2With dissolution of the hydro carbons in physical solvent
The difference of degree completes decarburization task, and common physical solvent has water, methanol, more glycol dimethyl ethers, propene carbonate, N- methyl
Pyrrolidones, more Ethylene Glycol Methyl isopropyl ethers and sulfolane etc., and the washing process that pressurizes be current industrialized European use compared with
More Methane decarbonization methods, then several solvents are chiefly used in selexol process decarburization.
The principle that pressure (hydraulic) water washes purifying biogas is under an increased pressure, by CO2It is dissolved in the water and reduces it in biogas
Content, process is usual are as follows: absorption tower is sent into after biogas pressurizes, water enters as absorbent from top, in absorption tower
Biogas is contacted with flow reversal from bottom to top, most of CO in biogas2With a small amount of CH4It is dissolved in water, rich CH4Gas is from absorption tower
Upper end be brought out, obtain bio-natural gas after being further dried；The water being discharged from absorb the bottom of the tower, which will enter flash column, to be dissolved
CH in water4With most of CO2It is released from water, this part mixed gas is mixed with unstripped gas again to participate in washing again
Wash separation；The water being discharged from flash column enters stripping tower and is desorbed, and carrying out stripping regeneration using decompression or air, (stripping is also referred to as
For air lift), absorption tower is returned to as absorbent later.
Pressure (hydraulic) water washes the abundance that the advantages of purifying biogas technique includes: water, nontoxic, Yi Zaisheng；CO2Removal efficiency
Height, methane losses are less；CO can be removed simultaneously2And H2S；Simple process, low operation temperature do not consume chemical reagent and steam, mistake
Cheng Huanbao.
In methane purification system, decompression desorption method is easy to operate, power consumption is small, and can recycle the dioxy of higher degree
Change carbon, however depressurizes the carbon dioxide after the completion of desorption in absorbing liquid still in saturation state, if desorption liquid returns to absorption tower
Re-use the efficiency that will affect absorption；Air stripping can be complete by the carbon dioxide eliminating in absorbing liquid, however benefit completely
Very big air mass flow is then needed with air stripping desorption, will increase the energy consumption of blower.Therefore CN101837227A discloses one
Absorption liquid desorption method in kind methane purification system, absorbing liquid are dropped by first order depressurization desorption, pressure from 0.6~1.6 MPa
To 0.1 MPa, most of carbon dioxide is removed, is then desorbed by second level air stripping, after the completion of desorption two in absorbing liquid
Carbonoxide removes completely substantially, is recycled to absorption tower and continues with.Although the technique can recycle the carbon dioxide of higher degree,
But the method for air stripping desorption is also used, introduces large quantity of air, and the amount of heat in air is transmitted into water supply, these
Water needs enter back into absorption tower after cooling, and temperature-fall period needs to consume big energy.
ZL201520937365.7 discloses a kind of desorption apparatus that purifying biogas is washed for pressure (hydraulic) water, is provided with ultrasonic wave
When Vibration Box washes purifying biogas to strengthen desorption process, for pressure (hydraulic) water and prepares bio-natural gas technique, desorption thoroughly, be can be avoided
The stripping process used in old process.But discovery by vapor liquid equilibrium due to being limited in actual experiment, even if using
Intensified by ultrasonic wave desorption process still contains a small amount of CO in the water after desorption2, that is, desorb and be still not thorough.
Summary of the invention
It is an object of the invention to make up the deficiency of prior art, a kind of method for washing purifying biogas for pressure (hydraulic) water is provided
And vacuum desorption discharge system, with the high problem of methane purification technology energy consumption due to caused by desorption process of reduction.
A kind of vacuum desorption discharge system for washing purifying biogas for pressure (hydraulic) water, it includes biogas compressor, and heat exchanger is done
Dry device, booster pump, flash column are depressured tower, desorber, water tank, desorber vacuum pump, desorber Vacuum discharge pump.With biogas
The heat exchanger of compressor outlet connection, the absorption tower being connected to heat exchanger exit pass through valve and drier at the top of absorption tower
Connection.Water tank water outlet is connected to by booster pump with absorption tower, and absorb the bottom of the tower passes through pipeline and valve and flash column top
Connection, flash column top are provided with valve and are connected to air accumulator, the top that flash distillation tower bottom passes through pipeline and valve and decompression tower
Connection；Decompression top of tower is provided with valve and is communicated with the atmosphere, and decompression tower bottom is connected to by pipeline with desorber top.It is desorbing
Top of tower is connected to desorber vacuum pump, and desorber vacuum pump is communicated with the atmosphere；Desorber lower part is provided with valve to be sent into
Air, desorption tower bottom are connected to desorber Vacuum discharge pump, and desorber Vacuum discharge pump is connected to by pipeline with water tank.
The specific feature of this programme is in addition, further include having water cooler, water tank water outlet is connected to water cooler, cold water
Unit is connected to by booster pump with absorption tower.
Water supply valve is provided on water tank.
Desorber is packed tower, 0.2 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, fills out
Expect that section is 2.0 meters high.
Absorption tower is packed tower, 0.1 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, fills out
Expect that section is 2.0 meters high.
Flash column is plate column, and 0.12 meter of tower internal diameter, the number of plates is 5 pieces.
Decompression tower is plate column, and 0.12 meter of tower internal diameter, the number of plates is 8 pieces.
The present invention also provides a kind of methods for washing purifying biogas for pressure (hydraulic) water, it includes the following steps:
Biogas is forced into 0.8 MPa through biogas compressor, is cooled to 20 DEG C through heat exchanger, is sent into absorption tower, natural pond later
Throughput is 20 L/min；
Water is cooled to 10 DEG C through water cooler, is forced into 0.8 MPa through booster pump, enters later from absorption tower top, water
Flow is 2.5 L/min, and biogas is inversely contacted with water from bottom to top in absorption tower, rich CH4Gas is from the top on absorption tower through valve
Door discharge stores after drier is dry as product gas；
The water being discharged from absorb the bottom of the tower enters flash column through valve, the control of pressure in flash column in 0.35 MPa,
In flash column, water is by the CH of dissolution4With part CO2Release, this part mixed gas through valve return air accumulator again with raw material
Gas mixing participates in washing separation again；The water being discharged from flash distillation tower bottom enters decompression tower through valve, and pressure drops to 0.1 MPa,
The carbon dioxide desorbed is discharged from the top of decompression tower through valve；
Enter desorber through valve from the water that decompression tower bottom is discharged later, the gas desorbed passes through at the top of desorber
Valve discharge, after be discharged through desorber vacuum pump, vacuum is maintained at 0.08 MPa in desorber, in addition through valve to desorption
Tower blasts air with the wind speed of 1.2 L/min, air inversely contacted with water from bottom to top after with the carbon dioxide one that desorbs
It rises and is discharged from the top of desorber through valve；
The water being discharged from desorption tower bottom enters water tank through valve and desorber Vacuum discharge pump, later by through cold water
Absorption tower is returned to after unit cooling and booster pump pressurization, supplement tap water is in addition controlled to maintain the liquid level of water tank by valve.
The present invention also provides a kind of vacuum desorption discharge systems that purifying biogas is washed for pressure (hydraulic) water, it includes Marsh gas compression
Machine, heat exchanger, drier, booster pump, flash column, be depressured tower, desorber, water tank, desorber vacuum pump, the first discharge tank and
Second discharge tank.With the heat exchanger of biogas compressor outlet, the absorption tower being connected to heat exchanger exit, at the top of absorption tower
It is connected to by valve with drier.Water tank water outlet be connected to by booster pump with absorption tower, absorb the bottom of the tower pass through pipeline with
Valve is connected to flash column top, is provided with valve at the top of flash column and is connected to air accumulator, and flash distillation tower bottom passes through pipeline and valve
Door is connected to the top of decompression tower；Decompression top of tower is provided with valve and is communicated with the atmosphere, and decompression tower bottom passes through pipeline and desorption
The connection of tower top.It is connected at the top of desorber with desorber vacuum pump, desorber vacuum pump is communicated with the atmosphere.
It is provided with the first discharge tank inlet at the top of the first discharge tank, the top of the first discharge tank is provided with first
Discharge tank air inlet and the first discharge tank exhaust outlet are provided with the first discharge tank leakage fluid dram in the bottom of the first discharge tank.First
The first intake valve communicated with the outside world is set on the pipeline before discharge tank air inlet, the pipe after the first discharge tank leakage fluid dram
Road is provided with the first tapping valve, is provided with first row air valve on the pipeline after the first discharge tank exhaust outlet.
It is provided with the second discharge tank inlet at the top of the second discharge tank, the top of the second discharge tank is provided with second
Discharge tank air inlet and the second discharge tank exhaust outlet are provided with the second discharge tank leakage fluid dram in the bottom of the second discharge tank.Second
The second intake valve communicated with the outside world is set on the pipeline before discharge tank air inlet, the pipe after the second discharge tank leakage fluid dram
Road is provided with the second tapping valve, is provided with second row air valve on the pipeline after the second discharge tank exhaust outlet.
It is provided with desorber gas outlet at the top of desorber, the top of desorber is provided with desorber feed inlet, is solving
The lower part for inhaling tower is provided with desorber bleed ports, and the bottom of desorber is provided with desorber discharge port.
Pipeline after desorber discharge port is divided into two-way, is connected all the way by the first outlet valve and the first discharge tank inlet
It is logical；Another way is connected to by the second outlet valve with the second discharge tank inlet.
The discharging pipeline of first discharge tank and the second discharge tank is connected to after converging with water tank.
The pipeline after pipeline and the second discharge tank exhaust outlet after first discharge tank exhaust outlet converges rear and desorber
Bleed ports connection.
Desorber material inlet valve, the pipeline after desorber gas outlet are set on the pipeline before desorber feed inlet
On set gradually desorber outlet valve and desorber vacuum pump.
The specific feature of this programme is in addition, further include having water cooler, water tank water outlet is connected to water cooler, cold water
Unit is connected to by booster pump with absorption tower.
The height of first discharge tank and the second discharge tank is 0.2 meter, and internal diameter is 0.15 meter.
Water supply valve is provided on water tank.
Absorption tower is packed tower, 0.1 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, fills out
Expect that section is 2.0 meters high；
Flash column is plate column, and 0.12 meter of tower internal diameter, the number of plates is 5 pieces；
Decompression tower is plate column, and 0.12 meter of tower internal diameter, the number of plates is 8 pieces；
Desorber is packed tower, 0.2 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, fills out
Expect that section is 2.0 meters high.
Methane content of bilogas is 53%(percentage by volume), carbon dioxide content is 47%(percentage by volume).
Ambient temperature is 28~30 DEG C.
The present invention also provides a kind of methods for washing purifying biogas for pressure (hydraulic) water, it is using above system equipment and including such as
Lower step:
Biogas is forced into 0.8 MPa through biogas compressor, is cooled to 20 DEG C through heat exchanger, is sent into absorption tower, natural pond later
Throughput is 20 L/min；
Water is cooled to 10 DEG C through water cooler, is forced into 0.8 MPa through booster pump, enters later from absorption tower top, water
Flow is 2.5 L/min, and biogas is inversely contacted with water from bottom to top in absorption tower, rich CH4Gas is from the top on absorption tower through valve
Door discharge stores after drier is dry as product gas；
The water being discharged from absorb the bottom of the tower enters flash column through valve, the control of pressure in flash column in 0.35 MPa,
In flash column, water is by the CH of dissolution4With part CO2Release, this part mixed gas through valve return air accumulator again with raw material
Gas mixing participates in washing separation again；The water being discharged from flash distillation tower bottom enters decompression tower through valve, and pressure drops to 0.1 MPa,
The carbon dioxide desorbed is discharged from the top of decompression tower through valve；
Enter desorber from the water that decompression tower bottom is discharged later, the gas desorbed is at the top of desorber through desorber
Outlet valve discharge, after be discharged through desorber vacuum pump, vacuum is maintained at 0.08 MPa in desorber.
It is in an open state in the first outlet valve, first row air valve, the second intake valve and the second tapping valve, the first intake valve,
When first tapping valve, the second outlet valve and second row air valve are in off state, desorber discharge port row of the water from desorption tower bottom
Enter the first discharge tank through the first outlet valve out, the air in the first discharge tank through first row air valve enter desorber and and water into
Row gas-liquid mass transfer is to promote to desorb, and the water in the second discharge tank is discharged through the second tapping valve, and extraneous air is through the second air inlet
Valve enters the second discharge tank；
It is in off state in the first outlet valve, first row air valve, the second intake valve and the second tapping valve, the first intake valve,
When first tapping valve, the second outlet valve and second row air valve are in an open state, water is from the discharge port discharge of desorption tower bottom through the
Two outlet valves enter the second discharge tank, and the air in the second discharge tank enters desorber through second row air valve and carries out gas-liquid with water
Mass transfer is to promote to desorb, and the water in the first discharge tank is discharged through the first tapping valve, and extraneous air enters through the first intake valve
First discharge tank；
Successively replace the switch state of switch valve, switch state is kept for 1 minute each time, realizes vacuum desorption discharging.
Enter water tank from the water that the first discharge tank and the second discharge tank are discharged later, water is delivered to cooling-water machine by water tank
Absorption tower is returned to after group cooling and booster pump pressurization.
The beneficial effect of this programme is: this programme washes purifying biogas process using the pressure (hydraulic) water of vacuum desorption, desorbs
Thoroughly, and the air capacity of system introducing greatly reduces, and the heat of introducing greatly reduces, and vacuum will also result in part water evaporation and reach
And there is refrigeration effect, therefore the water in system does not need cooling or can enter absorption tower purifying biogas slightly after cooling,
Greatly reduce energy consumption for cooling；Vacuum discharge is carried out using the method for switch valve switch, avoids and is pumped using Vacuum discharge, energy
Consumption reduces；Air, which enters, to be entered desorber from desorber lower part again after discharge tank and carries out gas-liquid mass transfer with water to promote to solve
It inhales, inhales hydrolysis thorough.
Detailed description of the invention
Fig. 1 is the vacuum desorption discharge system schematic diagram that purifying biogas is washed for pressure (hydraulic) water.
Fig. 2 is the process flow diagram of the pressurizing absorption purification biogas of the prior art.
Fig. 3 is the vacuum desorption discharge system vacuum desorption partial schematic diagram that purifying biogas is washed for pressure (hydraulic) water.
Fig. 4 is the vacuum desorption discharge system schematic diagram that purifying biogas is washed for pressure (hydraulic) water.
In figure: 101- biogas compressor；102- heat exchanger；The absorption tower 103-；104- valve；105- drier；106- is cold
Water dispenser group；107- booster pump；108- valve；109- flash column；110- valve；111- valve；112- is depressured tower；113- valve；
114- desorber material inlet valve；115- desorber；116- desorber outlet valve；117- desorber vacuum pump；118- valve；
119- valve；120- desorber Vacuum discharge pump；121- water tank；122- water supply valve；201- feed pump；202- air blower；
The first outlet valve of 301-；The first intake valve of 302-；The first discharge tank of 303-；The first tapping valve of 304-；305- first row air valve；
The second outlet valve of 306-；The second intake valve of 307-；The second discharge tank of 308-；The second tapping valve of 309-；310- second row air valve.
Specific embodiment
It is described in further detail with reference to the accompanying drawing and by specific embodiment to this programme.
Embodiment 1:
As shown in Figure 1, a kind of vacuum desorption discharge system for washing purifying biogas for pressure (hydraulic) water, it includes biogas compressor
101, heat exchanger 102, drier 105, water cooler 106, booster pump 107, flash column 109, decompression tower 112, desorber 115,
Water tank 121, desorber vacuum pump 117, desorber Vacuum discharge pump 120.With the heat exchanger of 101 outlet of biogas compressor
102, the absorption tower 103 with 102 outlet of heat exchanger is connected to by valve 104 with drier 105 at the top of absorption tower 103.
121 water outlet of water tank is connected to water cooler 106, and water cooler 106 is connected to by booster pump 107 with absorption tower 103, is absorbed
103 bottom of tower is connected to by pipeline and valve 108 with 109 top of flash column, and valve 110 and storage are provided at the top of flash column 109
Gas tank connection, 109 bottom of flash column are connected to by pipeline and valve 111 with the top of decompression tower 112；It is set at the top of decompression tower 112
It is equipped with valve 113 to be communicated with the atmosphere, decompression 112 bottom of tower passes through pipeline and desorber material inlet valve 114 and 115 top of desorber
Connection.It is connected to by desorber outlet valve 116 with desorber vacuum pump 117 at the top of desorber 115, desorber vacuum pump
117 are communicated with the atmosphere；Desorber lower part is provided with valve 118 to be sent into air, 115 bottom of desorber by valve 119 with
120 connection of desorber Vacuum discharge pump, desorber Vacuum discharge pump 120 are connected to by pipeline with water tank 121.
Water supply valve 122 is provided on water tank 121.
Wherein: absorption tower 103 is packed tower, 0.1 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel θ net
Ring filler, packing section are 2.0 meters high；
Flash column 109 is plate column, and 0.12 meter of tower internal diameter, the number of plates is 5 pieces；
Decompression tower 112 is plate column, and 0.12 meter of tower internal diameter, the number of plates is 8 pieces；
Desorber 115 is packed tower, 0.2 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring is filled out
Material, packing section are 2.0 meters high.
Methane content of bilogas is 53%(percentage by volume), carbon dioxide content is 47%(percentage by volume).
Ambient temperature is 28~30 DEG C.
A method of purifying biogas being washed for pressure (hydraulic) water, it includes the following steps:
Biogas is forced into 0.8 MPa through biogas compressor 101, is cooled to 20 DEG C through heat exchanger 102, is sent into absorbs later
Tower 103, biogas flow are 20 L/min；
Water is cooled to 10 DEG C through water cooler 106, is forced into 0.8 MPa through booster pump 107, later from absorption tower 103
Portion enters, and water flow is 2.5 L/min, and biogas is inversely contacted with water from bottom to top in absorption tower 103, rich CH4Gas is from absorption
The top of tower 103 is discharged through valve 104, stores after drier 105 is dry as product gas；
The water being discharged from 103 bottom of absorption tower enters flash column 109 through valve 108, and the pressure control in flash column 109 exists
0.35 MPa, in flash column 109, water is by the CH of dissolution4With part CO2It releases, this part mixed gas is through valve 110
Air accumulator is returned to participate in washing again separating with unstripped gas mixing again；The water being discharged from 109 bottom of flash column enters through valve 111
It is depressured tower 112, pressure drops to 0.1 MPa, and the carbon dioxide desorbed is discharged from the top of decompression tower 112 through valve 113；
Enter desorber 115 through desorber material inlet valve 114 from the water that decompression 112 bottom of tower is discharged later, desorbs
Gas be discharged from the top of desorber 115 through desorber outlet valve 116, after be discharged through desorber vacuum pump 117, desorber
Interior vacuum is maintained at 0.08 MPa, in addition blasts air, air to desorber 115 through valve 118 with the wind speed of 1.2 L/min
After inversely being contacted with water from bottom to top together with the carbon dioxide desorbed from the top of desorber 115 through desorber air outlet valve
Door 116 is discharged；
The water being discharged from 115 bottom of desorber enters water tank 121 through valve 119 and desorber Vacuum discharge pump 120, it
Afterwards by returning to absorption tower 103 after the cooling of water cooler 106 and booster pump 107 are pressurized, is in addition controlled and mended by water supply valve 122
Tap water is filled to maintain the liquid level of water tank 121.
106 energy consumption of water cooler is 0.1 kW/h；According to People's Republic of China (PRC) geological and mineral professional standard DZT
0064.47-1993 " groundwater quality method of inspection titration measuring free carbon dioxide " measurement is discharged from 115 bottom of desorber
Water in CO2Content is 11.05 mg/L；By Wuhan four directions Gasboard-3200 type biogas analysis-e/or determining product gas, it is formed
Are as follows: methane content is 96.40%(percentage by volume), carbon dioxide content is 3.59%(percentage by volume), water vapour content is
0.01%(percentage by volume).
The present embodiment washes purifying biogas process using the pressure (hydraulic) water of vacuum desorption, compares with embodiment 3, desorbs more thorough
Bottom, methane content is higher in product gas, and required energy consumption for cooling is lower.
Embodiment 2:
The present embodiment place same as Example 1 repeats no more, the difference is that:
Ambient temperature is 15~18 DEG C；The water being discharged from 115 bottom of desorber is pumped through valve 119 and desorber Vacuum discharge
120 enter water tank 121, cool down later without water cooler 106 and only return to absorption tower 103 after the pressurization of booster pump 107,
Water temperature maintains 9.5~10.5 DEG C.
According to People's Republic of China's geological and mineral professional standard DZT 0064.47-1993 " groundwater quality method of inspection
Titration measuring free carbon dioxide " measurement CO from the water that 115 bottom of desorber is discharged2Content is 11.20 mg/L；By force
Chinese four directions Gasboard-3200 type biogas analysis-e/or determining product gas is consisting of: methane content is 96.35%(volume basis
Number), carbon dioxide content is 3.64%(percentage by volume), water vapour content is 0.01%(percentage by volume).
The present embodiment washes purifying biogas process using the pressure (hydraulic) water of vacuum desorption, compares with embodiment 4, desorbs more thorough
Bottom, methane content is higher in product gas, does not use water cooler, reduces energy consumption for cooling.
Embodiment 3(comparative example):
As shown in Fig. 2, the process flow of the pressurizing absorption purification biogas of the prior art, including biogas compressor 101,
Heat exchanger 102, absorption tower 103, drier 105, water cooler 106, booster pump 107, flash column 109 are depressured tower 112, desorption
Tower 115, water tank 121, feed pump 201；Air blower 202.
This implementation use biogas compressor 101, heat exchanger 102, absorption tower 103, drier 105, water cooler 106,
Booster pump 107, flash column 109, decompression tower 112, desorber 115, water tank 121 are same as Example 1.
Methane content of bilogas is 53%(percentage by volume), carbon dioxide content is 47%(percentage by volume).
Ambient temperature is 28~30 DEG C.
Marsh gas purifying purification process place same as Example 1 repeats no more, the difference is that:
The water being discharged from decompression 112 bottom of tower enters desorber 115, solution through desorber material inlet valve 114 and feed pump 201
The gas sucked out is discharged from the top of desorber 115 through desorber outlet valve 116, in addition through air blower 202 to desorber 115
Blast air with the wind speed of 25 L/min, air inversely contacted with water from bottom to top after together with the carbon dioxide desorbed from
The top of desorber 115 is discharged through desorber outlet valve 116；The water being discharged from 115 bottom of desorber enters through valve 119 to be stored up
Water tank 121, later by returning to absorption tower 103 after the cooling of water cooler 106 and booster pump 107 are pressurized.
106 energy consumption of water cooler is 0.35 kW/h；According to People's Republic of China (PRC) geological and mineral professional standard DZT
0064.47-1993 " groundwater quality method of inspection titration measuring free carbon dioxide " measurement is discharged from 115 bottom of desorber
Water in CO2Content is 13.70 mg/L；By Wuhan four directions Gasboard-3200 type biogas analysis-e/or determining product gas, it is formed
Are as follows: methane content is 96.00%(percentage by volume), carbon dioxide content is 3.99%(percentage by volume), water vapour content is
0.01%(percentage by volume).
Embodiment 4(comparative example):
The present embodiment place same as Example 3 repeats no more, the difference is that: ambient temperature is 15~18 DEG C.
106 energy consumption of water cooler is 0.28 kW/h；According to People's Republic of China (PRC) geological and mineral professional standard DZT
0064.47-1993 " groundwater quality method of inspection titration measuring free carbon dioxide " measurement is discharged from 115 bottom of desorber
Water in CO2Content is 13.50 mg/L；By Wuhan four directions Gasboard-3200 type biogas analysis-e/or determining product gas, it is formed
Are as follows: methane content is 96.05%(percentage by volume), carbon dioxide content is 3.89%(percentage by volume), water vapour content is
0.01%(percentage by volume).
Embodiment 5:
As shown in figure 4, a kind of vacuum desorption discharge system for washing purifying biogas for pressure (hydraulic) water, it includes biogas compressor
101, heat exchanger 102, drier 105, water cooler 106, booster pump 107, flash column 109, decompression tower 112, desorber 115,
Water tank 121, desorber vacuum pump 117, the first discharge tank 303 and the second discharge tank 308.It exports and connects with biogas compressor 101
Logical heat exchanger 102, the absorption tower 103 with 102 outlet of heat exchanger pass through valve 104 and drying at the top of absorption tower 103
Device 105 is connected to.121 water outlet of water tank is connected to water cooler 106, and water cooler 106 passes through booster pump 107 and absorption tower
103 connections, 103 bottom of absorption tower are connected to 109 top of flash column by pipeline and valve 108, are provided at the top of flash column 109
Valve 110 is connected to air accumulator, and 109 bottom of flash column is connected to by pipeline and valve 111 with the top of decompression tower 112；Decompression
It is provided with valve 113 at the top of tower 112 to be communicated with the atmosphere, decompression 112 bottom of tower passes through pipeline and desorber material inlet valve 114 and solution
Inhale the connection of 115 top of tower.It is connected to, is solved with desorber vacuum pump 117 by desorber outlet valve 116 at the top of desorber 115
Tower vacuum pump 117 is inhaled to be communicated with the atmosphere.
Water supply valve 122 is provided on water tank 121.
As shown in figure 3, the first discharge tank inlet is provided at the top of the first discharge tank 303, in the first discharge tank 303
Top be provided with the first discharge tank air inlet and the first discharge tank exhaust outlet, the bottom of the first discharge tank 303 is provided with
One discharge tank leakage fluid dram.The first intake valve 302 communicated with the outside world is set on the pipeline before the first discharge tank air inlet,
The first tapping valve 304 is provided on pipeline after one discharge tank leakage fluid dram, on the pipeline after the first discharge tank exhaust outlet
It is provided with first row air valve 305.
The top of second discharge tank 308 is provided with the second discharge tank inlet, is arranged on the top of the second discharge tank 308
There are the second discharge tank air inlet and the second discharge tank exhaust outlet, the bottom of the second discharge tank 308 is provided with the second discharge tank row
Liquid mouth.The second intake valve 307 communicated with the outside world is set on the pipeline before the second discharge tank air inlet, is arranged in the second discharge tank
It is provided with the second tapping valve 309 on pipeline after liquid mouth, is provided with second on the pipeline after the second discharge tank exhaust outlet
Exhaust valve 310.
It is provided with desorber gas outlet at the top of desorber 115, the top of desorber is provided with desorber feed inlet,
The lower part of desorber is provided with desorber bleed ports, and the bottom of desorber is provided with desorber discharge port.
Pipeline after desorber discharge port is divided into two-way, passes through the first outlet valve 301 and the first discharge tank feed liquor all the way
Mouth connection；Another way is connected to by the second outlet valve 306 with the second discharge tank inlet.
The discharging pipeline of first discharge tank 303 and the second discharge tank 308 is connected to after converging with water tank 121.
The pipeline after pipeline and the second discharge tank exhaust outlet after first discharge tank exhaust outlet converges rear and desorber
Bleed ports connection.
Desorber material inlet valve 114 is set on the pipeline before desorber feed inlet, after desorber gas outlet
Desorber outlet valve 116 and desorber vacuum pump 117 are set gradually on pipeline.
The height of first discharge tank 303 and the second discharge tank 308 is 0.2 meter, and internal diameter is 0.15 meter.
Absorption tower 103 is packed tower, 0.1 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring is filled out
Material, packing section are 2.0 meters high；
Flash column 109 is plate column, and 0.12 meter of tower internal diameter, the number of plates is 5 pieces；
Decompression tower 112 is plate column, and 0.12 meter of tower internal diameter, the number of plates is 8 pieces；
Desorber 115 is packed tower, 0.2 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring is filled out
Material, packing section are 2.0 meters high.
Methane content of bilogas is 53%(percentage by volume), carbon dioxide content is 47%(percentage by volume).
Ambient temperature is 28~30 DEG C.
A method of purifying biogas being washed for pressure (hydraulic) water, it is using above system equipment and includes the following steps:
Biogas is forced into 0.8 MPa through biogas compressor 101, is cooled to 20 DEG C through heat exchanger 102, is sent into absorbs later
Tower 103, biogas flow are 20 L/min；
Water is cooled to 10 DEG C through water cooler 106, is forced into 0.8 MPa through booster pump 107, later from absorption tower 103
Portion enters, and water flow is 2.5 L/min, and biogas is inversely contacted with water from bottom to top in absorption tower 103, rich CH4Gas is from absorption
The top of tower 103 is discharged through valve 104, stores after drier 105 is dry as product gas；
The water being discharged from 103 bottom of absorption tower enters flash column 109 through valve 108, and the pressure control in flash column 109 exists
0.35 MPa, in flash column 109, water is by the CH of dissolution4With part CO2It releases, this part mixed gas is through valve 110
Air accumulator is returned to participate in washing again separating with unstripped gas mixing again；The water being discharged from 109 bottom of flash column enters through valve 111
It is depressured tower 112, pressure drops to 0.1 MPa, and the carbon dioxide desorbed is discharged from the top of decompression tower 112 through valve 113；
Enter desorber 115 through desorber material inlet valve 114 from the water that decompression 112 bottom of tower is discharged later, desorbs
Gas be discharged from the top of desorber 115 through desorber outlet valve 116, after be discharged through desorber vacuum pump 117, desorber
Interior vacuum is maintained at 0.08 MPa.
It is in an open state in the first outlet valve 301, first row air valve 305, the second intake valve 307 and the second tapping valve 309,
When first intake valve 302, the first tapping valve 304, the second outlet valve 306 and second row air valve 310 are in off state, water is from desorption
The desorber discharge port discharge of 115 bottom of tower enters the first discharge tank 303 through the first outlet valve 301, in the first discharge tank 303
Air enters desorber 115 through first row air valve 305 and carries out gas-liquid mass transfer with water to promote to desorb, and the second discharge tank 308
In water be discharged through the second tapping valve 309, extraneous air through the second intake valve 307 enter the second discharge tank 308；
It is in off state in the first outlet valve 301, first row air valve 305, the second intake valve 307 and the second tapping valve 309,
When first intake valve 302, the first tapping valve 304, the second outlet valve 306 and second row air valve 310 are in an open state, water is from desorption
The discharge port discharge of 115 bottom of tower enters the second discharge tank 308 through the second outlet valve 306, the air warp in the second discharge tank 308
Second row air valve 310 enters desorber 115 and carries out gas-liquid mass transfer with water to promote to desorb, and the water in the first discharge tank 303
It is discharged through the first tapping valve 304, extraneous air enters the first discharge tank 303 through the first intake valve 302；
Successively replace the switch state of switch valve, switch state is kept for 1 minute each time, realizes vacuum desorption discharging.
Enter water tank 121 from the water that the first discharge tank 303 and the second discharge tank 308 are discharged later, water tank 121 is by water
Absorption tower 103 is returned to after being delivered to the cooling of water cooler 106 and the pressurization of booster pump 107, is in addition controlled and is supplemented by water supply valve 122
Tap water is to maintain the liquid level of water tank 121.
106 energy consumption of water cooler is 0.11 kW/h；According to People's Republic of China (PRC) geological and mineral professional standard DZT
0064.47-1993 " groundwater quality method of inspection titration measuring free carbon dioxide " measurement is discharged from 115 bottom of desorber
Water in CO2Content is 9.89 mg/L；By Wuhan four directions Gasboard-3200 type biogas analysis-e/or determining product gas, it is formed
Are as follows: methane content is 96.60%(percentage by volume), carbon dioxide content is 3.39%(percentage by volume), water vapour content is
0.01%(percentage by volume).
The present embodiment washes purifying biogas process using the pressure (hydraulic) water of vacuum desorption, compares with embodiment 3, desorbs more thorough
Bottom, methane content is higher in product gas, and required energy consumption for cooling is lower, and avoids and pumped using Vacuum discharge.
Embodiment 6:
The present embodiment place same as Example 5 repeats no more, the difference is that:
Ambient temperature is 15~18 DEG C；The water being discharged from 115 bottom of desorber enters water tank 121 through valve 119, later
Cool down without water cooler 106 and only return to absorption tower 103 after the pressurization of booster pump 107, water temperature maintains 9.5~10.5
℃。
According to People's Republic of China's geological and mineral professional standard DZT 0064.47-1993 " groundwater quality method of inspection
Titration measuring free carbon dioxide " measurement CO from the water that 115 bottom of desorber is discharged2Content is 9.95 mg/L；By Wuhan
Cubic Gasboard-3200 type biogas analysis-e/or determining product gas is consisting of: methane content is 96.55%(percentage by volume),
Carbon dioxide content is 3.44%(percentage by volume), water vapour content is 0.01%(percentage by volume).
The present embodiment washes purifying biogas process using the pressure (hydraulic) water of vacuum desorption, compares with embodiment 4, desorbs more thorough
Bottom, methane content is higher in product gas, does not use water cooler, reduces energy consumption for cooling, and avoid and go out using vacuum
Material pump.
Claims (10)
1. a kind of vacuum desorption discharge system for washing purifying biogas for pressure (hydraulic) water, it includes biogas compressor, and heat exchanger is dry
Device, booster pump, flash column are depressured tower, desorber, water tank, desorber vacuum pump, desorber Vacuum discharge pump；With biogas pressure
The heat exchanger of contracting machine outlet, the absorption tower being connected to heat exchanger exit are connected at the top of absorption tower with drier；Water tank
Water outlet be connected to by booster pump with absorption tower, and absorb the bottom of the tower is connected to by pipeline with flash column top, flash column top and
Air accumulator connection, flash distillation tower bottom are connected to by pipeline with the top for being depressured tower；Decompression top of tower is communicated with the atmosphere, and is depressured tower bottom
Portion is connected to by pipeline with desorber top；It is characterized in that being connected at the top of desorber with desorber vacuum pump, desorber vacuum pump
It is communicated with the atmosphere；Air is sent into desorber lower part, and desorption tower bottom is connected to desorber Vacuum discharge pump, desorber Vacuum discharge
Pump is connected to by pipeline with water tank.
2. the vacuum desorption discharge system according to claim 1 for washing purifying biogas for pressure (hydraulic) water, characterized in that also wrap
Water cooler is included, water tank water outlet is connected to water cooler, and water cooler is connected to by booster pump with absorption tower.
3. the vacuum desorption discharge system according to claim 1 for washing purifying biogas for pressure (hydraulic) water, it is characterized in that desorption
Tower is packed tower, 0.2 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, packing section are 2.0 meters high.
4. the vacuum desorption discharge system according to claim 1 for washing purifying biogas for pressure (hydraulic) water, it is characterized in that absorbing
Tower is packed tower, 0.1 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, packing section are 2.0 meters high；
Flash column is plate column, and 0.12 meter of tower internal diameter, the number of plates is 5 pieces；Decompression tower be plate column, 0.12 meter of tower internal diameter, the number of plates 8
Block.
5. a kind of method for washing purifying biogas for pressure (hydraulic) water, it includes the following steps:
Biogas is forced into 0.8 MPa through biogas compressor, is cooled to 20 DEG C through heat exchanger, is sent into absorption tower, biogas stream later
Amount is 20 L/min；
Water is cooled to 10 DEG C through water cooler, is forced into 0.8 MPa through booster pump, enters later from absorption tower top, water flow
For 2.5 L/min, biogas is inversely contacted with water from bottom to top in absorption tower, rich CH4Gas is arranged from the top on absorption tower through valve
Out, it is stored after drier is dry as product gas；
The water being discharged from absorb the bottom of the tower enters flash column through valve, and the pressure in flash column is controlled in 0.35 MPa, is flashing
In tower, water is by the CH of dissolution4With part CO2It releases, this part mixed gas is returned air accumulator through valve and mixed again with unstripped gas
It closes and participates in washing separation again；The water being discharged from flash distillation tower bottom enters decompression tower through valve, and pressure drops to 0.1 MPa, desorption
Carbon dioxide out is discharged from the top of decompression tower through valve；
Enter desorber through valve from the water that decompression tower bottom is discharged later, the gas desorbed is at the top of desorber through valve
Discharge, after be discharged through desorber vacuum pump, vacuum is maintained at 0.08 MPa in desorber, in addition through valve to desorber with
The wind speed of 1.2 L/min blasts air, air inversely contacted with water from bottom to top after together with the carbon dioxide desorbed from
The top of desorber is discharged through valve；
The water being discharged from desorption tower bottom enters water tank through valve and desorber Vacuum discharge pump, later by through water cooler
Absorption tower is returned to after cooling and booster pump pressurization, supplement tap water is in addition controlled to maintain the liquid level of water tank by valve.
6. a kind of vacuum desorption discharge system for washing purifying biogas for pressure (hydraulic) water, it includes biogas compressor, and heat exchanger is dry
Device, booster pump, flash column are depressured tower, desorber, water tank, desorber vacuum pump, the first discharge tank and the second discharge tank；With
The heat exchanger of biogas compressor outlet, the absorption tower being connected to heat exchanger exit, is connected at the top of absorption tower with drier；
Water tank water outlet is connected to by booster pump with absorption tower, and absorb the bottom of the tower is connected to by pipeline with flash column top, flash column
Top is connected to air accumulator, and flash distillation tower bottom is connected to by pipeline with the top for being depressured tower；Decompression top of tower is communicated with the atmosphere, and drops
Pressure tower bottom is connected to by pipeline with desorber top；Be connected to desorber vacuum pump at the top of desorber, desorber vacuum pump and
Atmosphere；
It is provided with the first discharge tank inlet at the top of the first discharge tank, the top of the first discharge tank is provided with the first discharging
Canister incoming gas mouth and the first discharge tank exhaust outlet are provided with the first discharge tank leakage fluid dram in the bottom of the first discharge tank；First discharging
The first intake valve communicated with the outside world is set on the pipeline before canister incoming gas mouth, on the pipeline after the first discharge tank leakage fluid dram
It is provided with the first tapping valve, is provided with first row air valve on the pipeline after the first discharge tank exhaust outlet；
It is provided with the second discharge tank inlet at the top of the second discharge tank, the top of the second discharge tank is provided with the second discharging
Canister incoming gas mouth and the second discharge tank exhaust outlet are provided with the second discharge tank leakage fluid dram in the bottom of the second discharge tank；Second discharging
The second intake valve communicated with the outside world is set on the pipeline before canister incoming gas mouth, on the pipeline after the second discharge tank leakage fluid dram
It is provided with the second tapping valve, is provided with second row air valve on the pipeline after the second discharge tank exhaust outlet；
It is provided with desorber gas outlet at the top of desorber, the top of desorber is provided with desorber feed inlet, in desorber
Lower part be provided with desorber bleed ports, the bottom of desorber is provided with desorber discharge port；
Pipeline after desorber discharge port is divided into two-way, is connected to all the way by the first outlet valve with the first discharge tank inlet；
Another way is connected to by the second outlet valve with the second discharge tank inlet；
The discharging pipeline of first discharge tank and the second discharge tank is connected to after converging with water tank；
The pipeline after pipeline and the second discharge tank exhaust outlet after first discharge tank exhaust outlet converges rear and desorber bleed
Mouth connection；
On the pipeline before desorber feed inlet be arranged desorber material inlet valve, on the pipeline after desorber gas outlet according to
Secondary setting desorber outlet valve and desorber vacuum pump.
7. the vacuum desorption discharge system according to claim 6 for washing purifying biogas for pressure (hydraulic) water, characterized in that also wrap
Water cooler is included, water tank water outlet is connected to water cooler, and water cooler is connected to by booster pump with absorption tower.
8. the vacuum desorption discharge system according to claim 6 for washing purifying biogas for pressure (hydraulic) water, it is characterized in that described
The height of first discharge tank and the second discharge tank is 0.2 meter, and internal diameter is 0.15 meter.
9. the vacuum desorption discharge system according to claim 6 for washing purifying biogas for pressure (hydraulic) water, it is characterized in that absorbing
Tower is packed tower, 0.1 meter of tower internal diameter, loads diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, packing section are 2.0 meters high；
Flash column is plate column, and 0.12 meter of tower internal diameter, the number of plates is 5 pieces；
Decompression tower is plate column, and 0.12 meter of tower internal diameter, the number of plates is 8 pieces；Desorber is packed tower, and 0.2 meter of tower internal diameter, filling is straight
Diameter and 10 millimeters of Gao Douwei of stainless steel Dixon ring filler, packing section are 2.0 meters high.
10. a kind of method for washing purifying biogas for pressure (hydraulic) water, it is used as claimed in claim 6 for the pure natural pond of pressure (hydraulic) water elution
The vacuum desorption discharge system of gas simultaneously includes the following steps: biogas being forced into 0.8 MPa, cold through heat exchanger through biogas compressor
But to 20 DEG C, it is sent into absorption tower later, biogas flow is 20 L/min；
Water is cooled to 10 DEG C through water cooler, is forced into 0.8 MPa through booster pump, enters later from absorption tower top, water flow
For 2.5 L/min, biogas is inversely contacted with water from bottom to top in absorption tower, rich CH4Gas is discharged from the top on absorption tower, through dry
It is stored after dry device is dry as product gas；
The water being discharged from absorb the bottom of the tower enters flash column, and the pressure in flash column is controlled in 0.35 MPa, in flash column, water
By the CH of dissolution4With part CO2It releases, this part mixed gas time air accumulator is mixed with unstripped gas again to be participated in washing again
Wash separation；The water being discharged from flash distillation tower bottom enters decompression tower, and pressure drops to 0.1 MPa, and the carbon dioxide desorbed is from drop
Press the top discharge of tower；
Enter desorber from the water that decompression tower bottom is discharged later, the gas desorbed is discharged at the top of the desorber, after pass through
Desorber vacuum pump is discharged, and vacuum is maintained at 0.08 MPa in desorber；
It is in an open state in the first outlet valve, first row air valve, the second intake valve and the second tapping valve, the first intake valve, first
When tapping valve, the second outlet valve and second row air valve are in off state, warp is discharged from the desorber discharge port of desorption tower bottom in water
First outlet valve enters the first discharge tank, and the air in the first discharge tank enters desorber through first row air valve and carries out gas with water
Liquid mass transfer is to promote to desorb, and the water in the second discharge tank is discharged through the second tapping valve, extraneous air through the second intake valve into
Enter the second discharge tank；
It is in off state in the first outlet valve, first row air valve, the second intake valve and the second tapping valve, the first intake valve, first
When tapping valve, the second outlet valve and second row air valve are in an open state, water is discharged to go out through second from the discharge port of desorption tower bottom
Expect that valve enters the second discharge tank, the air in the second discharge tank enters desorber through second row air valve and carries out gas-liquid mass transfer with water
To promote desorption, and the water in the first discharge tank is discharged through the first tapping valve, and extraneous air enters first through the first intake valve
Discharge tank；
Successively replace the switch state of switch valve, switch state is kept for 1 minute each time, realizes vacuum desorption discharging.
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| CN107596871A (en) * | 2017-11-01 | 2018-01-19 | 安徽上造智能设备科技有限公司 | A kind of chemical workshop air cleaning unit |
| CN109852448B (en) * | 2019-04-01 | 2024-03-26 | 南京工业大学 | Device and method for absorbing and decarbonizing biogas by pressurized water by utilizing micro-channel mixing device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861509A (en) * | 2012-09-26 | 2013-01-09 | 开封黄河空分集团有限公司 | Biogas decarburization and tertiary desorption process |
| CN103897760A (en) * | 2014-04-10 | 2014-07-02 | 开封黄河空分集团有限公司 | Marsh gas purification system |
| CN205223136U (en) * | 2015-11-23 | 2016-05-11 | 山东省科学院能源研究所 | A desorption device that is used for pure marsh gas of pressure water elution |
| CN106744956A (en) * | 2016-12-22 | 2017-05-31 | 乐陵胜利新能源有限责任公司 | A kind of high-pressure washing methane purification carbon dioxide in process recovery process |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102861509A (en) * | 2012-09-26 | 2013-01-09 | 开封黄河空分集团有限公司 | Biogas decarburization and tertiary desorption process |
| CN103897760A (en) * | 2014-04-10 | 2014-07-02 | 开封黄河空分集团有限公司 | Marsh gas purification system |
| CN205223136U (en) * | 2015-11-23 | 2016-05-11 | 山东省科学院能源研究所 | A desorption device that is used for pure marsh gas of pressure water elution |
| CN106744956A (en) * | 2016-12-22 | 2017-05-31 | 乐陵胜利新能源有限责任公司 | A kind of high-pressure washing methane purification carbon dioxide in process recovery process |
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